package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.io.IOException;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
        //校验,获取openID路径
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    UserMapper userMapper;

    @Autowired
    WeChatProperties weChatProperties;

    @Override
    @Transactional
    public User loginUser(UserLoginDTO userLoginDTO) throws IOException {
        Map<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",userLoginDTO.getCode());
        map.put("grant_type","authorization_code");

        String json = HttpClientUtil.doPost(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);

        String openid = jsonObject.getString("openid");
        //判断openid是否为空，如果为空表示登录失败，抛出业务异常
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        User user = userMapper.selectByOpenId(openid);

        if(user == null){
            user = new User();

            user.setOpenid(openid);
            user.setCreateTime(LocalDateTime.now());
            /**添加新用户*/
            userMapper.insertUser(user);
        }

        return user;
    }
}
